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Rhodocrinites kirbyi

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Journal Article

Arm regeneration in Mississippian crinoids: evidence of intense predation pressure in the Paleozoic? Available to Purchase

Forest J. Gahn, Tomasz K. Baumiller
Journal: Paleobiology
Published: 01 January 2005
Paleobiology (2005) 31 (1): 151–164.
DOI: https://doi.org/10.1666/0094-8373(2005)031<0151:ARIMCE>2.0.CO;2
... sac. The highest regeneration frequency was observed in the most abundant species, Rhodocrinites kirbyi , a significantly higher value than expected under a model of no taxonomic selectivity (binomial: p < 0.05). Furthermore, bootstrapped simulations of the probable number of regenerated...
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View PDF for article title, Arm regeneration in Mississippian crinoids: evidence of intense predation pressure in the Paleozoic?
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Figure 6. Regeneration vs. size in Rhodocrinites kirbyi. Size is plotted as dorsal cup vs. crown height (in mm). Solid circles represent regenerated individuals

Figure 6. Regeneration vs. size in Rhodocrinites kirbyi . Size is plotted... Available to Purchase

Published: 01 January 2005
Figure 6. Regeneration vs. size in Rhodocrinites kirbyi . Size is plotted as dorsal cup vs. crown height (in mm). Solid circles represent regenerated individuals
Journal Article

Reconstructing predation pressure on crinoids: estimating arm-loss rates from regenerating arms Available to Purchase

Tomasz K. Baumiller, Forest J. Gahn
Journal: Paleobiology
Published: 01 January 2013
Paleobiology (2013) 39 (1): 40–51.
DOI: https://doi.org/10.1666/0094-8373-39.1.40
... comatulid loses arms at a rate of about once every ten days. The same approach reveals that Mississippian shallow-water crinoids ( Rhodocrinites kirbyi ) experienced arm loss much less frequently, approximately once every 36 days, suggesting that predation pressure on crinoids today is greater than...
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Figure 1. Le Grand Crinoids. This plate of Le Grand crinoids (BC-176), on display at Beloit College, Wisconsin, illustrates the exceptional preservation of this fauna. Cw, Cribanocrinus watersianus. Hl, Holcocrinus longicirrifer. Rn, Rhodocrinites nanus. All remaining specimens are Rhodocrinites kirbyi. Scale bar, 1 cm

Figure 1. Le Grand Crinoids. This plate of Le Grand crinoids (BC-176), on ... Available to Purchase

Published: 01 January 2005
are Rhodocrinites kirbyi . Scale bar, 1 cm
Image
Figure 4. Bootstrapped probabilities of the number of regenerating individuals in the living population of Rhodocrinites kirbyi at Le Grand. The solid curve represents probability simulations under a model of independent arm loss (mean = 142 regenerated individuals; SD = 13)

Figure 4. Bootstrapped probabilities of the number of regenerating individ... Available to Purchase

Published: 01 January 2005
Figure 4. Bootstrapped probabilities of the number of regenerating individuals in the living population of Rhodocrinites kirbyi at Le Grand. The solid curve represents probability simulations under a model of independent arm loss (mean = 142 regenerated individuals; SD = 13)
Image
Figure 2. Identifying regeneration in fossil crinoids. Regenerations were identified in this study by unusually small arms (A), and by an abrupt change in brachial size (B). Both specimens are Rhodocrinites kirbyi from BC-153. Arrows indicate the position of regenerated arms. Scale bar, 1 mm

Figure 2. Identifying regeneration in fossil crinoids. Regenerations were ... Available to Purchase

Published: 01 January 2005
Figure 2. Identifying regeneration in fossil crinoids. Regenerations were identified in this study by unusually small arms (A), and by an abrupt change in brachial size (B). Both specimens are Rhodocrinites kirbyi from BC-153. Arrows indicate the position of regenerated arms. Scale bar, 1 mm
Image
Figure 3. Examples of regeneration in Le Grand crinoids. A, Dichocrinus cinctus with all arms regenerating (BC-193). B, Holocrinus longicirrifer with regenerated anal sac (black arrow) and primaxil (white arrow) (BC-81). C, Rhodocrinites kirbyi with eight adjacent regenerating arms (BC-153). Scale bar, 5 mm

Figure 3. Examples of regeneration in Le Grand crinoids. A, Dichocrinus c... Available to Purchase

Published: 01 January 2005
Figure 3. Examples of regeneration in Le Grand crinoids. A, Dichocrinus cinctus with all arms regenerating (BC-193). B, Holocrinus longicirrifer with regenerated anal sac (black arrow) and primaxil (white arrow) (BC-81). C, Rhodocrinites kirbyi with eight adjacent regenerating arms (BC-153
Image
FIGURE 3—Examples of taxonomic/morphologic groups used in this study. (A) Rhodocrinites kirbyi (Wachsmuth and Springer, 1890), representative of the diplobathrids, BC-143. (B) Cusacrinus nodobrachiatus (Wachsmuth and Springer, 1890), representative of the monobathrids, BC-19. (C) Strimplecrinus inornatus (Wachsmuth and Springer, 1889), representative of the dichocrinids, BC-3. (D) Platycrinites symmetricus (Wachsmuth and Springer, 1888), representative of the platycrinitids, BC-143. (E) Holcocrinus longicirrifer (Wachsmuth and Springer, 1890), representative of the cladids, BC-176. (F) Eutaxocrinus fletcheri (Worthen, 1882), representative of the flexibles, BC-182. Scalebar = 1 cm

FIGURE 3 —Examples of taxonomic/morphologic groups used in this study. (A) ... Available to Purchase

Published: 01 February 2004
FIGURE 3 —Examples of taxonomic/morphologic groups used in this study. (A) Rhodocrinites kirbyi ( Wachsmuth and Springer, 1890 ), representative of the diplobathrids, BC-143. (B) Cusacrinus nodobrachiatus ( Wachsmuth and Springer, 1890 ), representative of the monobathrids, BC-19. (C
Image
Figure 7. Observed frequency of regenerating arms and probability of adjacent regenerating arms in Rhodocrinites kirbyi. Solid bars represent the number of regenerated arms in individuals sorted for exceptional preservation. Open bars represent the number of regenerated arms in specimens collected without regard to taphonomic state. The greater proportion of individuals missing only one arm in the unsorted data may be due to the inclusion of more poorly preserved specimens. The line with solid circles represents the probability that an individual will have S regenerating arms if all 30 arms are visible. The line with open circles represents the probability that an individual will have S regenerating arms if only half that number are visible, a more realistic scenario given that number of complete, observed arms ranged from 0 to 17 per individual (mean = 6.26; SD = 3.45)

Figure 7. Observed frequency of regenerating arms and probability of adjac... Available to Purchase

Published: 01 January 2005
Figure 7. Observed frequency of regenerating arms and probability of adjacent regenerating arms in Rhodocrinites kirbyi . Solid bars represent the number of regenerated arms in individuals sorted for exceptional preservation. Open bars represent the number of regenerated arms in specimens
Journal Article

A Bootstrap Analysis for Comparative Taphonomy Applied to Early Mississippian (Kinderhookian) Crinoids from the Wassonville Cycle of Iowa Available to Purchase

FOREST J. GAHN, TOMASZ K. BAUMILLER
Journal: PALAIOS
Published: 01 February 2004
PALAIOS (2004) 19 (1): 17–38.
DOI: https://doi.org/10.1669/0883-1351(2004)019<0017:ABAFCT>2.0.CO;2
...FIGURE 3 —Examples of taxonomic/morphologic groups used in this study. (A) Rhodocrinites kirbyi ( Wachsmuth and Springer, 1890 ), representative of the diplobathrids, BC-143. (B) Cusacrinus nodobrachiatus ( Wachsmuth and Springer, 1890 ), representative of the monobathrids, BC-19. (C...
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View PDF for article title, A Bootstrap Analysis for Comparative Taphonomy Applied to Early Mississippian (Kinderhookian) Crinoids from the Wassonville Cycle of Iowa
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Journal Article

Spinosity, regeneration, and targeting among Paleozoic crinoids and their predators Open Access

Valerie J. P. Syverson, Carlton E. Brett, Forest J. Gahn, Tomasz K. Baumiller
Journal: Paleobiology
Published: 01 May 2018
Paleobiology (2018) 44 (2): 290–305.
DOI: https://doi.org/10.1017/pab.2017.38
... have reported injury frequencies per arm, and the values in our sample are similar to the highest known such estimates in shallow-water crinoid populations from the Paleozoic, such as that of Rhodocrinites kirbyi (in which 75 of 970 examined arms were partially regenerated, i.e., 7.7%) from...
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Journal Article

Pre- and Postmortem Skeletal Modifications of the Cupressocrinitidae (Crinoidea, Cladida) Available to Purchase

Jan Bohatý
Published: 01 January 2009
Journal of Paleontology (2009) 83 (1): 45–62.
DOI: https://doi.org/10.1666/07-125R.1
... of the “Mediterranean Featherstar” Antedon mediterranea ( Lamarck, 1816 ). Amemiya and Oji (1992) described the crinoid regeneration processes. The regeneration in fossil crinoids was also discussed by Gahn and Baumiller (2005) . For example, they showed arm regeneration of Rhodocrinites kirbyi ( Wachsmuth...
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